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Diffstat (limited to 'sound/usb/format.c')
-rw-r--r--sound/usb/format.c445
1 files changed, 445 insertions, 0 deletions
diff --git a/sound/usb/format.c b/sound/usb/format.c
new file mode 100644
index 000000000000..cbfe0c23dbd6
--- /dev/null
+++ b/sound/usb/format.c
@@ -0,0 +1,445 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/usb.h>
+#include <linux/usb/audio.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+
+#include "usbaudio.h"
+#include "card.h"
+#include "quirks.h"
+#include "helper.h"
+#include "debug.h"
+
+/*
+ * parse the audio format type I descriptor
+ * and returns the corresponding pcm format
+ *
+ * @dev: usb device
+ * @fp: audioformat record
+ * @format: the format tag (wFormatTag)
+ * @fmt: the format type descriptor
+ */
+static int parse_audio_format_i_type(struct snd_usb_audio *chip,
+ struct audioformat *fp,
+ int format, void *_fmt,
+ int protocol)
+{
+ int pcm_format, i;
+ int sample_width, sample_bytes;
+
+ switch (protocol) {
+ case UAC_VERSION_1: {
+ struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
+ sample_width = fmt->bBitResolution;
+ sample_bytes = fmt->bSubframeSize;
+ break;
+ }
+
+ case UAC_VERSION_2: {
+ struct uac_format_type_i_ext_descriptor *fmt = _fmt;
+ sample_width = fmt->bBitResolution;
+ sample_bytes = fmt->bSubslotSize;
+
+ /*
+ * FIXME
+ * USB audio class v2 devices specify a bitmap of possible
+ * audio formats rather than one fix value. For now, we just
+ * pick one of them and report that as the only possible
+ * value for this setting.
+ * The bit allocation map is in fact compatible to the
+ * wFormatTag of the v1 AS streaming descriptors, which is why
+ * we can simply map the matrix.
+ */
+
+ for (i = 0; i < 5; i++)
+ if (format & (1UL << i)) {
+ format = i + 1;
+ break;
+ }
+
+ break;
+ }
+
+ default:
+ return -EINVAL;
+ }
+
+ /* FIXME: correct endianess and sign? */
+ pcm_format = -1;
+
+ switch (format) {
+ case UAC_FORMAT_TYPE_I_UNDEFINED: /* some devices don't define this correctly... */
+ snd_printdd(KERN_INFO "%d:%u:%d : format type 0 is detected, processed as PCM\n",
+ chip->dev->devnum, fp->iface, fp->altsetting);
+ /* fall-through */
+ case UAC_FORMAT_TYPE_I_PCM:
+ if (sample_width > sample_bytes * 8) {
+ snd_printk(KERN_INFO "%d:%u:%d : sample bitwidth %d in over sample bytes %d\n",
+ chip->dev->devnum, fp->iface, fp->altsetting,
+ sample_width, sample_bytes);
+ }
+ /* check the format byte size */
+ switch (sample_bytes) {
+ case 1:
+ pcm_format = SNDRV_PCM_FORMAT_S8;
+ break;
+ case 2:
+ if (snd_usb_is_big_endian_format(chip, fp))
+ pcm_format = SNDRV_PCM_FORMAT_S16_BE; /* grrr, big endian!! */
+ else
+ pcm_format = SNDRV_PCM_FORMAT_S16_LE;
+ break;
+ case 3:
+ if (snd_usb_is_big_endian_format(chip, fp))
+ pcm_format = SNDRV_PCM_FORMAT_S24_3BE; /* grrr, big endian!! */
+ else
+ pcm_format = SNDRV_PCM_FORMAT_S24_3LE;
+ break;
+ case 4:
+ pcm_format = SNDRV_PCM_FORMAT_S32_LE;
+ break;
+ default:
+ snd_printk(KERN_INFO "%d:%u:%d : unsupported sample bitwidth %d in %d bytes\n",
+ chip->dev->devnum, fp->iface, fp->altsetting,
+ sample_width, sample_bytes);
+ break;
+ }
+ break;
+ case UAC_FORMAT_TYPE_I_PCM8:
+ pcm_format = SNDRV_PCM_FORMAT_U8;
+
+ /* Dallas DS4201 workaround: it advertises U8 format, but really
+ supports S8. */
+ if (chip->usb_id == USB_ID(0x04fa, 0x4201))
+ pcm_format = SNDRV_PCM_FORMAT_S8;
+ break;
+ case UAC_FORMAT_TYPE_I_IEEE_FLOAT:
+ pcm_format = SNDRV_PCM_FORMAT_FLOAT_LE;
+ break;
+ case UAC_FORMAT_TYPE_I_ALAW:
+ pcm_format = SNDRV_PCM_FORMAT_A_LAW;
+ break;
+ case UAC_FORMAT_TYPE_I_MULAW:
+ pcm_format = SNDRV_PCM_FORMAT_MU_LAW;
+ break;
+ default:
+ snd_printk(KERN_INFO "%d:%u:%d : unsupported format type %d\n",
+ chip->dev->devnum, fp->iface, fp->altsetting, format);
+ break;
+ }
+ return pcm_format;
+}
+
+
+/*
+ * parse the format descriptor and stores the possible sample rates
+ * on the audioformat table (audio class v1).
+ *
+ * @dev: usb device
+ * @fp: audioformat record
+ * @fmt: the format descriptor
+ * @offset: the start offset of descriptor pointing the rate type
+ * (7 for type I and II, 8 for type II)
+ */
+static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audioformat *fp,
+ unsigned char *fmt, int offset)
+{
+ int nr_rates = fmt[offset];
+
+ if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
+ snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
+ chip->dev->devnum, fp->iface, fp->altsetting);
+ return -1;
+ }
+
+ if (nr_rates) {
+ /*
+ * build the rate table and bitmap flags
+ */
+ int r, idx;
+
+ fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
+ if (fp->rate_table == NULL) {
+ snd_printk(KERN_ERR "cannot malloc\n");
+ return -1;
+ }
+
+ fp->nr_rates = 0;
+ fp->rate_min = fp->rate_max = 0;
+ for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
+ unsigned int rate = combine_triple(&fmt[idx]);
+ if (!rate)
+ continue;
+ /* C-Media CM6501 mislabels its 96 kHz altsetting */
+ if (rate == 48000 && nr_rates == 1 &&
+ (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||
+ chip->usb_id == USB_ID(0x0d8c, 0x0102)) &&
+ fp->altsetting == 5 && fp->maxpacksize == 392)
+ rate = 96000;
+ /* Creative VF0470 Live Cam reports 16 kHz instead of 8kHz */
+ if (rate == 16000 && chip->usb_id == USB_ID(0x041e, 0x4068))
+ rate = 8000;
+
+ fp->rate_table[fp->nr_rates] = rate;
+ if (!fp->rate_min || rate < fp->rate_min)
+ fp->rate_min = rate;
+ if (!fp->rate_max || rate > fp->rate_max)
+ fp->rate_max = rate;
+ fp->rates |= snd_pcm_rate_to_rate_bit(rate);
+ fp->nr_rates++;
+ }
+ if (!fp->nr_rates) {
+ hwc_debug("All rates were zero. Skipping format!\n");
+ return -1;
+ }
+ } else {
+ /* continuous rates */
+ fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
+ fp->rate_min = combine_triple(&fmt[offset + 1]);
+ fp->rate_max = combine_triple(&fmt[offset + 4]);
+ }
+ return 0;
+}
+
+/*
+ * parse the format descriptor and stores the possible sample rates
+ * on the audioformat table (audio class v2).
+ */
+static int parse_audio_format_rates_v2(struct snd_usb_audio *chip,
+ struct audioformat *fp,
+ struct usb_host_interface *iface)
+{
+ struct usb_device *dev = chip->dev;
+ unsigned char tmp[2], *data;
+ int i, nr_rates, data_size, ret = 0;
+
+ /* get the number of sample rates first by only fetching 2 bytes */
+ ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
+ USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
+ 0x0100, chip->clock_id << 8, tmp, sizeof(tmp), 1000);
+
+ if (ret < 0) {
+ snd_printk(KERN_ERR "unable to retrieve number of sample rates\n");
+ goto err;
+ }
+
+ nr_rates = (tmp[1] << 8) | tmp[0];
+ data_size = 2 + 12 * nr_rates;
+ data = kzalloc(data_size, GFP_KERNEL);
+ if (!data) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ /* now get the full information */
+ ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
+ USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
+ 0x0100, chip->clock_id << 8, data, data_size, 1000);
+
+ if (ret < 0) {
+ snd_printk(KERN_ERR "unable to retrieve sample rate range\n");
+ ret = -EINVAL;
+ goto err_free;
+ }
+
+ fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
+ if (!fp->rate_table) {
+ ret = -ENOMEM;
+ goto err_free;
+ }
+
+ fp->nr_rates = 0;
+ fp->rate_min = fp->rate_max = 0;
+
+ for (i = 0; i < nr_rates; i++) {
+ int rate = combine_quad(&data[2 + 12 * i]);
+
+ fp->rate_table[fp->nr_rates] = rate;
+ if (!fp->rate_min || rate < fp->rate_min)
+ fp->rate_min = rate;
+ if (!fp->rate_max || rate > fp->rate_max)
+ fp->rate_max = rate;
+ fp->rates |= snd_pcm_rate_to_rate_bit(rate);
+ fp->nr_rates++;
+ }
+
+err_free:
+ kfree(data);
+err:
+ return ret;
+}
+
+/*
+ * parse the format type I and III descriptors
+ */
+static int parse_audio_format_i(struct snd_usb_audio *chip,
+ struct audioformat *fp,
+ int format, void *_fmt,
+ struct usb_host_interface *iface)
+{
+ struct usb_interface_descriptor *altsd = get_iface_desc(iface);
+ struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
+ int protocol = altsd->bInterfaceProtocol;
+ int pcm_format, ret;
+
+ if (fmt->bFormatType == UAC_FORMAT_TYPE_III) {
+ /* FIXME: the format type is really IECxxx
+ * but we give normal PCM format to get the existing
+ * apps working...
+ */
+ switch (chip->usb_id) {
+
+ case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
+ if (chip->setup == 0x00 &&
+ fp->altsetting == 6)
+ pcm_format = SNDRV_PCM_FORMAT_S16_BE;
+ else
+ pcm_format = SNDRV_PCM_FORMAT_S16_LE;
+ break;
+ default:
+ pcm_format = SNDRV_PCM_FORMAT_S16_LE;
+ }
+ } else {
+ pcm_format = parse_audio_format_i_type(chip, fp, format, fmt, protocol);
+ if (pcm_format < 0)
+ return -1;
+ }
+
+ fp->format = pcm_format;
+
+ /* gather possible sample rates */
+ /* audio class v1 reports possible sample rates as part of the
+ * proprietary class specific descriptor.
+ * audio class v2 uses class specific EP0 range requests for that.
+ */
+ switch (protocol) {
+ case UAC_VERSION_1:
+ fp->channels = fmt->bNrChannels;
+ ret = parse_audio_format_rates_v1(chip, fp, _fmt, 7);
+ break;
+ case UAC_VERSION_2:
+ /* fp->channels is already set in this case */
+ ret = parse_audio_format_rates_v2(chip, fp, iface);
+ break;
+ }
+
+ if (fp->channels < 1) {
+ snd_printk(KERN_ERR "%d:%u:%d : invalid channels %d\n",
+ chip->dev->devnum, fp->iface, fp->altsetting, fp->channels);
+ return -1;
+ }
+
+ return ret;
+}
+
+/*
+ * parse the format type II descriptor
+ */
+static int parse_audio_format_ii(struct snd_usb_audio *chip,
+ struct audioformat *fp,
+ int format, void *_fmt,
+ struct usb_host_interface *iface)
+{
+ int brate, framesize, ret;
+ struct usb_interface_descriptor *altsd = get_iface_desc(iface);
+ int protocol = altsd->bInterfaceProtocol;
+
+ switch (format) {
+ case UAC_FORMAT_TYPE_II_AC3:
+ /* FIXME: there is no AC3 format defined yet */
+ // fp->format = SNDRV_PCM_FORMAT_AC3;
+ fp->format = SNDRV_PCM_FORMAT_U8; /* temporarily hack to receive byte streams */
+ break;
+ case UAC_FORMAT_TYPE_II_MPEG:
+ fp->format = SNDRV_PCM_FORMAT_MPEG;
+ break;
+ default:
+ snd_printd(KERN_INFO "%d:%u:%d : unknown format tag %#x is detected. processed as MPEG.\n",
+ chip->dev->devnum, fp->iface, fp->altsetting, format);
+ fp->format = SNDRV_PCM_FORMAT_MPEG;
+ break;
+ }
+
+ fp->channels = 1;
+
+ switch (protocol) {
+ case UAC_VERSION_1: {
+ struct uac_format_type_ii_discrete_descriptor *fmt = _fmt;
+ brate = le16_to_cpu(fmt->wMaxBitRate);
+ framesize = le16_to_cpu(fmt->wSamplesPerFrame);
+ snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
+ fp->frame_size = framesize;
+ ret = parse_audio_format_rates_v1(chip, fp, _fmt, 8); /* fmt[8..] sample rates */
+ break;
+ }
+ case UAC_VERSION_2: {
+ struct uac_format_type_ii_ext_descriptor *fmt = _fmt;
+ brate = le16_to_cpu(fmt->wMaxBitRate);
+ framesize = le16_to_cpu(fmt->wSamplesPerFrame);
+ snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
+ fp->frame_size = framesize;
+ ret = parse_audio_format_rates_v2(chip, fp, iface);
+ break;
+ }
+ }
+
+ return ret;
+}
+
+int snd_usb_parse_audio_format(struct snd_usb_audio *chip, struct audioformat *fp,
+ int format, unsigned char *fmt, int stream,
+ struct usb_host_interface *iface)
+{
+ int err;
+
+ switch (fmt[3]) {
+ case UAC_FORMAT_TYPE_I:
+ case UAC_FORMAT_TYPE_III:
+ err = parse_audio_format_i(chip, fp, format, fmt, iface);
+ break;
+ case UAC_FORMAT_TYPE_II:
+ err = parse_audio_format_ii(chip, fp, format, fmt, iface);
+ break;
+ default:
+ snd_printd(KERN_INFO "%d:%u:%d : format type %d is not supported yet\n",
+ chip->dev->devnum, fp->iface, fp->altsetting, fmt[3]);
+ return -1;
+ }
+ fp->fmt_type = fmt[3];
+ if (err < 0)
+ return err;
+#if 1
+ /* FIXME: temporary hack for extigy/audigy 2 nx/zs */
+ /* extigy apparently supports sample rates other than 48k
+ * but not in ordinary way. so we enable only 48k atm.
+ */
+ if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
+ chip->usb_id == USB_ID(0x041e, 0x3020) ||
+ chip->usb_id == USB_ID(0x041e, 0x3061)) {
+ if (fmt[3] == UAC_FORMAT_TYPE_I &&
+ fp->rates != SNDRV_PCM_RATE_48000 &&
+ fp->rates != SNDRV_PCM_RATE_96000)
+ return -1;
+ }
+#endif
+ return 0;
+}
+
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-07 12:02:01 +0300